London has been battered by 50mph winds that have felled trees and caused travel chaos. Powerful gusts swept across the capital as the Met Office issued a yellow "be aware" weather alert for most of the country.

Apple unveiled its first budget iPhone as it revealed a new futuristic device which features a fingerprint reader.

Chief executive Tim Cook promised the cheap 5C gadget would come with "all the great technology that customers have loved" on its previous models.

The tech giant announced the departure from its traditional high-end handsets just minutes before it confirmed rumours that the iPhone 5S would be equipped with a scanner to unlock the device and put an end to the days of passwords.

The cheaper version of the iPhone - launched at a time when Apple arguably faces stiffer competition than ever - will be an obvious rival to some of the low-cost gadgets sold by the firm's major competitors.

Mr Cook introduced the device during a presentation at Apple's California base - streamed live at a conference in Berlin - which he used to introduce the iPhone 5S, "the most forward-thinking phone we have ever created".

The new flagship mobile - dubbed the "gold standard in smartphones" by the tech giant - will come in more traditional Apple colours of silver and slate grey as well as a new golden hue.

The cheaper 5C costs 99 US dollars (£63) over a two-year contract or 736 US dollars ( £469) as a one-off payment. It is billed as a handset that will be "more fun" than any iPhone yet and will come in a range of five vivid colours: blue, white, pink, yellow and green.

It was finally shown to the world after a series of images leaked online claimed to show the 5S while the web was awash with speculation that Apple would also branch out with a budget device.

Mr Cook said: "The business has become so large that this year we are going to replace the iPhone 5 and we are going to replace it with not one but two new designs. This allows us to serve even more customers."

Apple's Philip Schiller told the audience: "iPhone 5s is the most forward-thinking smartphone in the world, delivering desktop class architecture in the palm of your hand." He raised a massive round of applause as he introduced the fingertip scanner - named Touch ID - which, he said, would provide a "simple and secure way to unlock your phone with just a touch of your finger."